Re: [w3photo] Image regions

"Benjamin Nowack" <bnowack@appmosphere.com>>- what about subclassing Polygon
and Ellipse, so that
>  w3p:Circle rdfs:subClassOf w3p:Ellipse and
>  w3p:Rectangle rdfs:subClassOf w3p:Polygon.
>  This would lead to only two basic shapes/region types that
>  a tool would need to support. (plus the optional boundingBox)

This isn't possible since the coords property changes its semantics
depending on the rdf:Type of the class, if we subClass like the above, we
end up in the situation that with

<some img:Rectangle>  img:coords "20,20 40,40"

then doing the sub/superclassing

<some img:Polygon> img:Coords "20,20 40,40"

Which is not equivalent!

Jim.

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